netdev - RE: PATCH: Network Device Naming mechanism and policy

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Message-ID: <EDA0A4495861324DA2618B4C45DCB3EE58954D@blrx3m08.blr.amer.dell.com>
Date:	Tue, 13 Oct 2009 22:43:49 +0530
From:	<Narendra_K@...l.com>
To:	<dannf@...com>
Cc:	<netdev@...r.kernel.org>, <linux-hotplug@...r.kernel.org>,
	<Matt_Domsch@...l.com>, <Jordan_Hargrave@...l.com>,
	<Charles_Rose@...l.com>
Subject: RE: PATCH: Network Device Naming mechanism and policy


>> These device nodes are not functional at the moment - open() returns 
>> -ENOSYS.  Their only purpose is to provide userspace with a kernel 
>> name to ifindex mapping, in a form that udev can easily manage.
>
>If the idea is just to provide a userspace-visible mapping 
>(and presumably take advantage of udev's infrastructure for 
>naming) does this need kernel changes? Could this be a 
>hierarchy under e.g. /etc/udev instead, using plain text 
>files? It still means we need something like libnetdevname for 
>apps to do the translation, but I'm not seeing why it matters 
>how this map is stored. Is there some special property of the 
>character devices (e.g. uevents) that we're not already 
>getting with the existing interfaces?

Yes. The char device by itself doesn't help in any way. But it provides
a flexible mechanism to provide multiple names for the same device, just
the way it is for disks.

With regards,
Narendra K
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